Research on metal flow law and strengthening mechanism of cold extrusion internal thread

Chen, Xin; Hou, Hongling; Lei, Wu; Huang, Tao; Zhao, Yongqiang

doi:10.1007/s40430-022-03418-w

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…When the "liquidecosystem" system is in the "low-growth area system, " the growth rate of a large amount of direct effluent is positively correlated with the economic growth rate, while it is negatively correlated with the "high-growth area system." It can be seen that "sustainable health development" model, and an economic development phenomenon of "pollution for growth" between China's coastal economic growth and marine ecological environment protection, and the internal relationship between China's economic growth and marine pollution will change with the transfer of different regional states (Chen et al, 2022; Table 3).…”

Section: Measuring the Intrinsic Relationship Between Economic Growth...mentioning

confidence: 99%

Research on the internal mechanism and path of the new growth point of marine biological economy

Zhou

2022

Front. Ecol. Evol.

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In order to explore how the marine economy can realize the new growth point of economic development, this study puts forward a research method based on the internal mechanism and path of the new growth point of marine economic development. This method recommends key technical problems and solutions based on the research method of the internal mechanism and path of developing new growth points, amphibious science that further integrates, ecological, and socialized theory and application and explores the internal mechanism and path of how the marine economy realizes the new growth points of economic development. The research shows that the research on the internal mechanism and path of developing new growth points has increased the marine economy by nearly 45%, deeply analyzes the internal relationship between coastal economic growth and marine pollution, the close relationship between marine resources development and marine economic growth, and briefly summarizes the marine economic growth path against the background of the adjustment and change of marine industrial structure.

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Section: Measuring the Intrinsic Relationship Between Economic Growth...mentioning

confidence: 99%

Research on the internal mechanism and path of the new growth point of marine biological economy

Zhou

2022

Front. Ecol. Evol.

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“…The main factors affecting the quality of internal thread extrusion forming are bottom hole diameter, extrusion speed, and extrusion lubrication. Chen et al [1] derived the calculation formula for the bottom hole diameter of the internal thread for the cold extrusion process according to the deformation method and the metal-plastic deformation theory. The formula was modified and verified by processing tests, taking thread size, extrusion tap, and material into account.…”

Section: Introductionmentioning

confidence: 99%

Research on Extrusion Forming Process of Micro Internal Thread for Nickel-plated Aluminum Alloy Parts

Shen,

Yang,

Zhang

2024

J. Phys.: Conf. Ser.

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With the development of electronic products in the direction of miniaturization and lightweight, the specifications of thread gradually become minor, and the high-precision forming of micro threads has become an urgent problem to be solved. In this paper, the extrusion forming process of the micro internal thread was mainly studied on the nickel-plated aluminum alloy parts. The process route suitable for the internal thread forming on electroplated parts was designed, and the key parameters of thread bottom hole diameter and thread tapping speed were determined by experiment. Aiming at the typical problem of internal thread blocked by a broken tap, a thread repair method based on laser ablation was proposed and the laser processing parameters were optimized. Eventually, the manufacturing of M1 micro internal thread on nickel-plated aluminum alloy parts was successfully realized.

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“…In recent years, Stéphan et al [7][8][9] established a relationship between the diameter of the bottom hole, the profile and tooth height of the internal thread, studied the effects of different processing parameters on temperature and torque during the processing and optimised the extrusion effect. Li et al [10][11][12][13] obtained correction formulas for the area and volume of materials after extrusion deformation through the flow law of metals during cold extrusion, analysed the strengthening mechanism of internal threads. Jiang et al [14] optimised the process parameters during the cold extrusion of internal threads, and compared the forming quality of internal threads from the microhardness of the surface layer of the thread and the depth of the hardened layer.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of the residual stress distribution of internal thread cold extrusion and tap wear

Wan

Jing

et al. 2023

Strain

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In order to improve the thread‐forming quality of diesel engine piston connecting rod, the internal thread cold extrusion process was adopted for the through‐hole structure of 42CrMo4 high‐strength steel. The influence of different structural parameters of the tap on the residual stress distribution of the cold extrusion internal threads and self‐wear were discussed with the help of three‐dimensional elastic–plastic finite element model. The wear of tap was observed by an electron microscope, coordinated with the residual stress distribution of thread was measured by X‐ray diffraction to explore the relationship between residual stress distribution of the cold extrusion internal thread, tool wear and tap structure. The optimal combination of tap structure parameters of residual stress and tool wear was obtained through grey relation method. The residual compressive stress and the depth of stress layer near the thread surface increased and the wear condition of the extrusion tap was improved when the tap with optimised structural parameters was used for processing, while maintaining the original thread connection strength. The results show that the internal thread with better‐forming quality can be obtained by using the optimised extrusion tap, while the service life of the tap was prolonged.

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Research on metal flow law and strengthening mechanism of cold extrusion internal thread

Cited by 8 publications

References 16 publications

Research on the internal mechanism and path of the new growth point of marine biological economy

Research on the internal mechanism and path of the new growth point of marine biological economy

Research on Extrusion Forming Process of Micro Internal Thread for Nickel-plated Aluminum Alloy Parts

Numerical and experimental investigation of the residual stress distribution of internal thread cold extrusion and tap wear

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